San Antonio Air Quality in April
Across 2019–2025, San Antonio's April air quality had a median AQI of 61 (Moderate) over 210 monitored days in the San Antonio-New Braunfels, TX area. 2.4% of April days (5 of 210) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 62.9% of days. The cleanest April on record here was 2023 (median AQI 54, 0 days above 100) and the worst was 2020 (median 62, 2 days above 100, peak AQI 136).
- Good: 23.3%
- Moderate: 74.3%
- Unhealthy for Sensitive Groups: 2.4%
- Unhealthy or worse: 0.0%
Extra Protection for San Antonio Homes
Air quality in San Antonio is moderate (AQI 52), with fine particles (PM2.5) the main concern. A True-HEPA purifier gives sensitive groups — kids, seniors and anyone with asthma or allergies — cleaner air indoors on days like today.
Recommended: Coway AP-1512HH Mighty — True HEPA + carbon · CADR ~246 CFM · rooms up to 361 sq ft
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How is the air in San Antonio in April?
Moderate on a typical day: median AQI 61 across 2019–2025, with 2.4% of April days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓23.3% of April days were Good (AQI 0–50), 74.3% Moderate (51–100).
- ✓5 days of 210 reached AQI 101+; the April peak was 136.
- ✓Best April: 2023; worst April: 2020.
Frequently asked questions
What is the air quality like in San Antonio in April?▾
Across 2019–2025, the median daily AQI in San Antonio in April was 61 (Moderate). 23.3% of days were Good, 74.3% Moderate, and 2.4% reached Unhealthy for Sensitive Groups or worse, based on 210 monitored days in EPA's Air Quality System.
Is April a good time for outdoor exercise in San Antonio?▾
A typical April day in San Antonio is Moderate (median AQI 61): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 42 of April days (2.4%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes San Antonio's April air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 62.9% of April days in San Antonio. The highest April AQI recorded in 2019–2025 was 136 (Unhealthy for Sensitive Groups), in 2020.
San Antonio April air quality, year by year
San Antonio April air quality by year (San Antonio-New Braunfels, TX, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 30 | 58 | 0 | 100 | O3 |
| 2020worst | 30 | 62 | 2 | 136 | PM2.5 |
| 2021 | 30 | 62 | 1 | 119 | PM2.5 |
| 2022 | 30 | 61 | 0 | 88 | PM2.5 |
| 2023cleanest | 30 | 54 | 0 | 81 | PM2.5 |
| 2024 | 30 | 62 | 1 | 102 | PM2.5 |
| 2025 | 30 | 64 | 1 | 115 | PM2.5 |
What April air means in San Antonio
A typical April day in San Antonio is Moderate (median AQI 61): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 42 of April days (2.4%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
April's median AQI of 61 is above San Antonio's whole-year median of 55, making it one of the area's dirtier periods. Nationally, the median April AQI across every EPA metro area (100,677 metro-days, 2019–2025) is 44, so San Antonio runs above the national April norm; 2.4% of its April days topped AQI 100 versus 0.7% nationally (above average).
April is part of San Antonio's spring season (March, April, May); the spring page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in San Antonio
The latest EPA AirNow observation puts San Antonio's AQI at 52 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current San Antonio air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (San Antonio-New Braunfels, TX), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.